Campbell Scientific CS511-LSensorex Dissolved

Oxygen ProbeRevision: 6/12

C o p y r i g h t © 2 0 0 1 - 2 0 1 2C a m p b e l l S c i e n t i f i c , I n c .

PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. (CSI) primarily for the US market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors:

Area: 1 in2 (square inch) = 645 mm2 Length: 1 in. (inch) = 25.4 mm 1 ft (foot) = 304.8 mm 1 yard = 0.914 m 1 mile = 1.609 km Mass: 1 oz. (ounce) = 28.35 g 1 lb (pound weight) = 0.454 kg Pressure: 1 psi (lb/in2) = 68.95 mb Volume: 1 US gallon = 3.785 litres

In addition, part ordering numbers may vary. For example, the CABLE5CBL is a CSI part number and known as a FIN5COND at Campbell Scientific Canada (CSC). CSC Technical Support will be pleased to assist with any questions.

CS511-L Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections.

1. General Information.....................................................1

2. Specifications ..............................................................2

3. Optional Probe Accessories .......................................3

4. Optional Agitator .........................................................3

5. Application Information ..............................................4

6. Wiring............................................................................5

7. Programming ...............................................................5 7.1 CRBasic ....................................................................................................5 7.2 Edog..........................................................................................................7

8. Calibration ....................................................................8

9. Maintenance .................................................................9

10. Agitator Control .........................................................9

Appendices

A. Dissolved Oxygen Tables....................................... A-1

B. Sensorex Model DO6200/T ..................................... B-1 B.1 DO6200/T Specifications.....................................................................B-1 B.2 Accessories for DO6200/T...................................................................B-2

Figures 1-1. CS511-L ..................................................................................................2 4-1. Preventing Bio-fouling of the CS510-L ..................................................3 4-2. CS510-L with PT4 Agitator ....................................................................4

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CS511-L Table of Contents

ii

10-1. Agitator Wiring .................................................................................. 10 B-1. Sensorex’s Model DO6200/T ............................................................ B-1

Tables 6-1. Sensor Wiring......................................................................................... 5 7-1. Wiring for Example 1 ............................................................................. 5 7-2. Wiring for Example 2 ............................................................................. 7

Examples 1. Sample CR1000 Program using VoltDiff .................................................. 5 2. Sample CR200(X) Program....................................................................... 6 3. Portion of CR10X Sample Program using P1............................................ 8 4. Portion of CR10X Sample Program using P2............................................ 8 5. Sample Program using Expression ............................................................ 9 6. Sample Program using P36 ........................................................................ 9 7. Portion of CR1000 Program using Portset............................................... 10 8. Portion of CR200(X) Program using Portset ........................................... 10 9. Portion of CR10X Program using P86 and P22 Instructions................... 10

Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe An accurate and reliable sensor is a critical element in any measurement system. The CS511 meets these criteria for the measurement of dissolved oxygen. The CS511 is manufactured by Sensorex.

1. General Information The CS511 is a galvanic probe which produces a millivolt signal proportional to the amount of oxygen present in the measured medium. Oxygen diffuses through the membrane onto the cathode, reacts chemically, and combines with the anode. An electrical current is produced by this chemical reaction which is converted from microamps to millivolts by an in-line resistor. An in-line thermistor also conditions the signal providing automatic temperature compensation. With these features, the probe produces a millivolt output proportional to the oxygen present in the medium in which it is placed.

The probe consists of two parts, an upper part with cathode, anode and cable, and a lower part comprising a screw on membrane cap. The probe is shipped dry, but has a membrane installed in the cap. With the membrane in place, the cap must be filled with electrolyte solution before the cap is screwed onto the top component.

The probe is self-polarizing and requires no external power source. There are three wires to connect. The shield wire generally should be used.

Because the probe's output is linear, it is possible to connect it directly to a data acquisition system capable of handling the small millivolt signal.

The probe's robust construction and simple design make maintenance and servicing it straightforward. There is no need to send the probe back to the factory for servicing. It utilizes a strong, easy-to-clean and easy-to-change membrane in a screw-on membrane cap. Regular servicing is not required. When necessary the probe can be fully overhauled in five minutes.

Currently, the CS511 is Sensorex’s Model DO6400/T. Prior to June 2008, the CS511 was Sensorex’s Model DO6200/T. Programming, wiring, and most specifications are the same for these two sensors. However, they use different accessories and look different (see Figure 1). Refer to Appendix B if you have Sensorex’s Model DO6200/T.

NOTE

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

DO6200/T DO6400/T

FIGURE 1-1. The CS511-L is currently Sensorex’s DO6400/T (left). The DO6200/T (right) was shipped prior to June 2008 (refer to Appendix B).

2. Specifications Principle of Measurement: Membrane covered galvanic oxygen probe

Output Signal: 33 mV ± 9 mV (100% saturation), < 2 mV (0% saturation)

Accuracy: Better than ± 2% of reading ± 1 digit when calibration temperature equals measuring temperature ± 5°C

Response Time: 5 minutes from 100% to 0% oxygen

Materials of Construction: Body: Anode: Cathode:

Noryl Silver Zinc

Diameter 5.72 cm (2.25 in)

Height: 17.78 cm (7 in) from bottom of sensor to end of cable strain relief

Shipping Weight 0.8 kg (1.75 lb)

Cable: no standard length—all custom made as requested, PVC jacketed

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

Operating Conditions: Temperature Pressure: Minimum Submersion Depth: Minimum Water Flow:

0° to 50°C (32° to 122°F) 0 to 100 psig 60 mm (2 ½ in) 5 cm/s (2 in/sec) across membrane

Calibration: In air or in air saturated water

Temperature Compensation: Automatic from 4° to 40°C (40° to 104°F)

Range of Dissolved Oxygen: 0.5 to 50 ppm

Probe Electrolyte: NaCl + glycerol (prevents freezing)

3. Shipping Kit and Accessories Except for the agitator, these items are for Sensorex’s DO6400/T. Refer to Appendix B if you have a DO6200/T.

NOTE

3.1 Shipping Kit (1) Membrane replacement tool (1) Bottled DO electrolyte, 250 ml (2) Teflon membranes (2) Membrane o-rings (2) Membrane spaces

3.2 Optional Probe Accessories • PT4 Agitator for stagnant conditions

• 22261 Maintenance Kit containing (5) Teflon membranes, (5) membrane o-rings, (5) tensioning washers, and a 250-ml bottle of electrolyte

• 22262 Maintenance Kit containing (25) Teflon membranes, (25) membrane o-rings, (25) tensioning washers, and a 500-ml bottle of electrolyte

• 22263 Spare Parts Kit containing (2) membrane locks, (2) tensioning washers, (2) body o-rings, and (1) membrane replacement tool

4. Optional Agitator The PT4 Agitator is a reliable and robust agitator for use in conjunction with probes subjected to bio-fouling in ponds and stagnant water conditions.

O2 probes require a minimum water velocity across their membranes to function properly. Therefore, to measure DO in stagnant water conditions, it is necessary to move the water past the membrane to get accurate and reliable DO measurements. In many instances the water also has a high bio-loading and the probes become fouled resulting in inaccurate DO measurements.

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

FIGURE 4-1. Preventing Bio-fouling of a DO Sensor

The PT4 Agitator overcomes these problems. The device is designed so that a soft bristle brush sweeps across the probe membrane or sensor tip. This sweeping action of the brush provides the required water velocity as well as prevents the membrane from becoming bio-fouled.

The optimum sweeping frequency depends upon the design of probe and type of membrane used and water conditions. An ON-time of 0.25 seconds and OFF-time of 5 seconds is suitable in most circumstances.

Agitator’s overall size: 7-1/8" x 3-1/4" diameter, 1-1/4 lb. (180mm x 83mm, 0.6 kg) Supplied with 10 ft. (3 meters) cable. Power required: 10.5 to 18 VDC at the agitator, 1.1 amps. Maximum ON-time is

3 seconds.

FIGURE 4-2. CS510-L with PT4 Agitator

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

5. Application Information SCWin users: This manual was written primarily for those whose needs are not met by SCWin. Your procedure is much simpler: just add the Sensorex probe (it’s in the water folder), save your program, and follow the wiring shown in Step 2 of SCWIN.

NOTE

6. Wiring The Sensorex probe can use one differential channel or one single-ended channel. Differential wiring is better at rejecting electrical noise and ground loop error.

TABLE 6-1. Sensor Wiring

Color

Function

CR510, CR10X, CR800, CR850, CR23X, CR1000, CR3000, CR5000

CR200(X)-Series

White Signal + Differential High, or Single-Ended Channel

Single-Ended Channel

Black Signal - Differential Low or AG Ground

Clear Shield Ground Ground

7. Programming The datalogger is programmed using either CRBasic or Edlog. Dataloggers that use CRBasic include our CR200(X)-series, CR800, CR850, CR1000, CR3000, and CR5000. Dataloggers that use Edlog include our CR510, CR10X, and CR23X. CRBasic and Edlog are included with LoggerNet and PC400 software.

7.1 CRBasic In the CR800, CR850, CR1000, CR3000, and CR5000, the VoltDiff() or VoltSE() can be used to measure the CS511. In the CR200(X)-series dataloggers, only the VoltSE() instruction can be used since these dataloggers do not support differential measurements. Example program 1 is a CR1000 program that uses the VoltDiff() instruction. Example Program 2 is a CR200(X) program.

EXAMPLE 1. Sample CR1000 Program using VoltDiff

This example is a CR1000 program but programming for the CR800, CR850, CR3000, and CR5000 is similar. Table 7-1 shows the wiring for the example.

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

TABLE 7-1. Wiring for Example 1

CR1000 Connection Sensor Wire

1H White

1L Black

Ground Clear

'CR1000 'Declare Variables and Units Public Batt_Volt Public DOmV Public DOppm Units Batt_Volt=Volts Units DOmV=mV Units DOppm=ppm 'Define Data Tables DataTable(Table1,True,-1) DataInterval(0,60,Min,10) Sample(1,DOmV,FP2) Sample(1,DOppm,FP2) Sample(1,Batt_Volt,FP2) EndTable DataTable(Table2,True,-1) DataInterval(0,1440,Min,10) Minimum(1,Batt_Volt,FP2,False,False) EndTable 'Main Program BeginProg Scan(5,Sec,1,0) 'Default Datalogger Battery Voltage measurement Batt_Volt: Battery(Batt_Volt) 'CS511 Dissolved Oxygen Probe measurements DOmV and DOppm: VoltDiff(DOmV,1,mV250,1,True,0,_60Hz,1,0) DOppm=DOmV*0.34 'Call Data Tables and Store Data CallTable(Table1) CallTable(Table2) NextScan EndProg

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

EXAMPLE 2. Sample CR200(X) Program

The CR200(X)-series must use the VoltSE() instruction since these dataloggers do not make differential measurements. If the other CRBasic dataloggers use the VoltSE() instruction instead of the VoltDiff() instruction, their programming will be similar to this example. Table 7-2 shows the wiring for the example.

TABLE 7-2. Wiring for Example 2

CR200(X) Connection Sensor Wire

SE1 White

Ground Black

Ground Clear

'CR200(X) Series 'Declare Variables and Units Public Batt_Volt Public DOmV Public DOppm Units Batt_Volt=Volts Units DOmV=mV Units DOppm=ppm 'Define Data Tables DataTable(Table1,True,-1) DataInterval(0,60,Min) Sample(1,DOmV) EndTable DataTable(Table2,True,-1) DataInterval(0,1440,Min) Minimum(1,Batt_Volt,False,False) EndTable 'Main Program BeginProg Scan(10,Sec) 'Default Datalogger Battery Voltage measurement Batt_Volt: Battery(Batt_Volt) 'CS511 Dissolved Oxygen Probe measurements DOmV and DOppm: VoltSE(DOmV,1,1,1,0) DOppm=DOmV*0.34 'Call Data Tables and Store Data CallTable(Table1) CallTable(Table2) NextScan EndProg

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

7.2 Edlog Edlog Instruction 1 or 2 can be used. Example 1 shows the single-ended instruction for measuring the Sensorex probe; example 2 shows the differential instruction. The example measurement instructions that follow do not store data to final storage. Additional instructions (typically P92, P77, and output processing instructions such as P70) are required to store data permanently.

EXAMPLE 3. Portion of CR10X Sample Program using P1

1: Volt (SE) (P1) 1: 1 Reps 2: 24 250 mV 60 Hz Rejection Range ; code 23 used for CR23X 3: 1 SE Channel 4: 1 Loc [ DOmV ] 5: 1.0 Multiplier *See Calibration* 6: 0.0 Offset

EXAMPLE 4. Portion of CR10X Sample Program using P2

1: Volt (Diff) (P2) 1: 1 Reps 2: 24 250 mV 60 Hz Rejection Range ; code 23 used for CR23X 3: 1 DIFF Channel 4: 1 Loc [ DOmV ] 5: 1.0 Multiplier *See Calibration* 6: 0.0 Offset

8. Calibration The multiplier is used to calibrate the Sensorex probe. To calculate the multiplier:

1) Program the datalogger using a multiplier of one.

2) Place the OxyGuard probe in the air, shaded from the sun. Wait for readings to stabilize. This may take 15 minutes or more.

3) Determine the air temperature and barometric pressure.

4) Using a calibration chart such as that provided in Appendix A, determine the oxygen concentration of the air.

5) Use the following equation to calculate the multiplier: M = P/R M = Multiplier P = Concentration in PPM of the air (from the calibration chart) R = The signal output of the OxyGuard probe when using a multiplier of one

6) Change the multiplier in the datalogger program from one to the calculated number.

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

A more common way to enter the multiplier is to insert a separate instruction in the program. This will allow a new multiplier to be added to the program without rewriting, compiling, and downloading the program to the datalogger.

CRBasic dataloggers can use an expression. The multiplier value is entered into the expression through the Public Table using the numeric display in PC200W, PC208W, LoggerNet, PC400, PConnect, or PConnectCE.

EXAMPLE 5. Sample Program using Expression

DOppm = DOMult * DOmV

Edlog dataloggers use Instruction 36. The multiplier is entered into an input location called DOmult using the numeric display in PC200W, PC208W, LoggerNet, PC400, PConnect, PConnectCE, or the datalogger keyboard display.

EXAMPLE 6. Sample Program using P36

57: Z=X*Y (P36) 1: 1 X Loc [ DOmV ] 2: 2 Y Loc [ DOmult ] 3: 3 Z Loc [ DOppm ]

9. Maintenance The Sensorex probe needs little maintenance. Regular cleaning of the membrane is all that is required. The membrane is very durable and can be cleaned with a cloth or soft paper. Do not scratch it clean with your fingernail.

Letting the CS511 dry up will shorten the life of the membrane and probe. If the CS511 needs to be stored out of water for extended periods of time, it should be drained of solution, and the membrane should be replaced when the probe’s deployed. If the CS511 dries up while in the field, the probe should be recalibrated before using it again.

10. Agitator Control In low flow conditions (less than about 5 cm/sec), it may be necessary to add an agitator to the Sensorex probe. Campbell Scientific ships the agitator with a repeat cycle timer. Using the repeat cycle timer requires no datalogger programming. However, some users choose to use a solid state relay and have the datalogger agitate the water on the probe face either periodically throughout the day or just before measurement. Agitating just before the measurement saves on power and causes less wear and tear on the agitator and probe membrane.

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

The wiring for the agitator as controlled by this example program would be as follows:

BLUE

WHITE Agitator

+ -

12 V Battery

4 1

#7321 Relay Crydom D1D07

3 2

Ground/G

Datalogger

Port C1

FIGURE 10-1. Agitator Wiring

The following instructions would trigger the agitator as discussed in the agitator manual.

In the CR800, CR850, CR1000, CR3000, and CR5000, use the Portset instruction.

EXAMPLE 7. Portion of CR1000 Program using Portset

Portset (1,1) Delay (1,500,msec) Portset (1,0)

In the CR200(X)-series, use the Portset instruction.

EXAMPLE 8. Portion of CR200(X) Program using Portset

Portset (1,1) Delay(500,msec) Portset(1,0)

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

In the CR510, CR10X, and CR23X, use instruction P86 and P22.

EXAMPLE 9. Portion of CR10X Program using P86 and P22 Instructions

45: Do (P86) 1: 41 Set Port 1 High 46: Excitation with Delay (P22) 1: 1 Ex Channel 2: 20 Delay W/Ex (units = 0.01 sec) 3: 0 Delay After Ex (units = 0.01 sec) 4: 0 mV Excitation 47: Do (P86) 1: 51 Set Port 1 Low 48: End (P95)

The above examples are not as power efficient as possible and would require AC power to maintain a sufficient battery charge. If it is necessary to operate an agitator without AC power available, write the program so that the agitator is only operated for a short period of time just before the measurement is to be taken.

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Campbell Scientific CS511-L Sensorex Dissolved Oxygen Probe

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Appendix A. Dissolved Oxygen Tables

A-1

Appendix A. Dissolved Oxygen Tables

A-2

Appendix B. Sensorex Model DO6200/T Prior to June 2008, Campbell Scientific’s CS511 was Sensorex’s Model DO6200/T (see Figure B-1) instead of Sensorex’s Model DO6400/T. Programming, wiring, and some specifications are the same for these two sensors. However, they look different and use different accessories.

FIGURE B-1. Sensorex’s Model DO6200/T

B.1 DO6200/T Specifications Principle of Measurement: Membrane covered galvanic oxygen probe

Output Signal: 1.65 mV ± .45 mV per mg/l

Accuracy: Better than ± 2 % of reading ± 1 digit when calibration temperature equals measuring temperature ± 5°C

Output Impedance: 10 k Ohms nominal

Response Time: After equilibration, 2 minute for 90% of final value

Materials of Construction: Probe body: O-rings: Membrane:

Delrin Membrane O-ring = Buna N Body Seal O-ring = Viton 0.05 mm (2 mil) Teflon

Dimensions and Weight: 8.9 cm (3.5 in) height, 5.6 cm (2.2 in) diameter, 0.5 kg (1.1 lb)

B-1

Appendix B. Sensorex Model DO6200/T

B-2

Cable: standard length 3 m (10 ft); other lengths available upon request 5-wire 22 awg shielded, PVC jacketed

Operating Conditions: Temperature Pressure: Minimum Submersion Depth: Minimum Water Flow:

0° to 50°C (32° to 122°F) Maximum 10 atmospheres (147 psig) 60 mm (2 ½ in) 5 cm/s (2 in/sec) across membrane

Calibration: In air or in air saturated water

Temperature Compensation: Automatic from 4° to 40°C (40° to 104°F)

Range of Dissolved Oxygen: 0-20 mg/l, 0-200 % Sat

Electrode Materials: Ag cathode/Zn anode

Probe Electrolyte: NaCl

B.2 Accessories for DO6200/T 14054 Teflon Membrane for DO6200/T (Qty 5) 14053 Teflon Membrane for DO6200/T (Qty 25) 14056 Membrane Replacement Tool for DO6200/T 14055 DO Electrolyte for DO6200/T, 500 ml

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